Typewriting-machine



w F. HELMOND. TYPEWRITING MACHlNE. APPLlCATION FILED MAY14, I919.

Patented Dec. 20, 1921.

STATES PATENT oFFicE.

WILLIAM FVI-ITLIVIOND, on HARTFORD, connnc'rrcn'r, assrenon. T0 unnnnwoon-I 'rrrnwnirnn company, on new roan, n. Y, A conronarron on NEW YORK.

rYPnwnrrIno-Metomnn nannies.

Application filed May 14,

This invention relates to the feed-roll mechanism for typewriting machines, and is herein disclosed as applied to the shift-frame of an Underwood standard machine. 7

It is essential that the feed-rolls press firmly against the platen, to cause worksheets to be fed accurately; and the. rolls must be resiliently mounted, so as to accommodate work-sheets of varying thicknesses, or many plies of work-sheets, and must also he'easily cast off. At the same time, it is essential that the mechanism be compact and light, and it must work easily and positively,

. With these obj sets in mind, I have utilized the usual feed-roll shafts and the swinging arms on which they are journaled, and have coiled sorings around the main tie-rod of the shiftframe, on which the {arms are mounted; and have provided tension-controlling means, compact in form and easilv adjusted, to enable the springs to be tightened up to any desired extent, after the mechanism is assembled. Such a structure not only enables the assembling of the shiftframe to be economically accomplished, but also permits a casting off mechanism, sub stantially identical with the usual. Underwood type, to be utilized.

As one of the important features of the invention I provide individual worm and screw-tensioning devices for each .of the fced-roll springs, the parts of said devices being so positioned, relatively to each other,

that the various worms and screws maybe made in duplicate, yet each spring may be tensioned by a right-hand turn of its respective adjusting screw.v

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a perspective view of an Underwood shift-frame, omitting many parts, and other parts being broken away.

Fig. 2 isa sectional side view of the same.

Fig. 3 is dissected. perspective view,

specification'cf Letters IPatent. paftfillted Dec. 20, 1921.

1919. Serial No. 297,097.

showing the spring, the arm which it tensions, and the adjusting means.

Fig. a is a plan view of part of the'shaft,

showing two springs and the connections for each.

Fig. 5 is a dissected perspective of the spring-adjusting screws to show the relative direction of the screw threads.

In the usual Underwood typewriting machine, the carriage is provided with ashift frame, which includes a paper table 10, ends 11, and a bottom tie-rod 12, which connects the ends. T he platen'13 is journaled by its axis 1st in the ends 11, and work-sheets passed around the platen over the paper table 10 are held up against the. platen by rear feed-rolls 15 and front feed-rolls 16, which usually are loose upon the shafts 1.7 and 18, respectively, said shafts extending practically the length of the platen and journaled upon oppositely'extending arms 19 and 20, which, in turn, are journaled upon the tie rod 12. provided'with a hub 21, which forms an enlarged journal for it upon the shaft or tierod 12. In order to hold the rolls 15 and 16 against the platen, there is fast to each hub 21 a spring 22 coiled around the shaft 12,

Each arm 19 and 20 isand of heavy resilient wire, the otherend of v 1 each spring being anchored a ring 28, forming a worm hub, which is also journaled upon the tie rod 12. in order to cause any spring 22 to swing itsarm 19 or 20 toward the platen, the hub 23 is adapted to, be rotated by its worm screw 24:, and to effectthis rotation, there is provided for each worm-screw 24 a screw 25 having an enlarged head 26, adaptedto bear against the outside edge of a mount in the form ofa block 27 fast to the tie-rod 12. Each screw 25 is provided with a screw-driver nick 28, by which the screw may be turned to tighten up its spring 22 to any desired extent.

Each block 27 comprises an arc-shaped face 29, which overlies the worm wheel 24 and the ring 23, and also an opening 30in assembled upon the tie-rod l2, properly spaced from each other by hangers 3d and 35 ,whichsupport the usual cast" 36'. Any tensioning of the springslmay be done later witha screw-driver in a convenient position by turning the carriage upside down. The hanger 35 also serves as a support for the roll, not shown, which runs upon the usual shift rail. The casting-ofishatt 36 may be of substantially the. usual form,

including flat portions 38 which are adapted to permit lugs 39, extending downwa ll}; from the arms 19 and 20,.t0 be swung inwardly by the springs 22 as the rolls are swung toward the platen. -To enable the shaft 36 to be rotated and thereby cause the journaled on said bar, front and rear't'eed-j lugs 39 to be cammed outwardly so as to withdraw the feed-rolls from the. platen against the tenslon of their." springs 22, said shattt may be provided with the usual cranlea H1 40, connected by the usual link ll to the usual operating lever or linger-piece d3.

mounted on the stub-shaft 42 near the top of the shit-frame.

In order to-make the operation of the screws for tightening the springs seem nat uraLthat is to say, to make them all turn tethenght in the tlg'htenlng operation, the screws which serve to tighten the springs for the forwardly-projecting arms 20 are so,

locatedas toen 'aoe their res Jective wormt; L; V4" 1 I 1 wheels at the rear of the tie-rod l2 while tne screws 'WlllCil serve to tighten the springs for the rearwardly-projecting arms 19 are so located as to enpa' e their'res oeetive wormo b l wheels "forwardly of said tie-rod 12. \"Vhen so arranged, all the screws may have right hand threads, and all of the screws-and worm-wheels may be made in duphcate. It

may also be observed that the screws 25 are Havingthus described my invention;

claim:

'lQThe combination, with the letter-spacing carriage of atypewriter, havingr'a platen and a platen-fame mounted therein, of a feed-roll-supporting bar mounted. in said frame; forwardly and rearwardly-proj ectingg feed-rouse ort n arm's'soaced alone and r i": A c

rolls'supported by said arms, springs coiled about said-bar; one for each arm, worm wheels journaled on said bar, one for each spring, each 'sprlng belng connected at one end to an arm and at its other end to a wormwheeha spring-adjusting screw in mesh with each worm-wheel, and mount for each screw. said mount'sbeing fixed to said bar, and said screws being journaled in said mounts, with their heads disposed downwardly, so as tobe accessible-from below on movement of said carriage to one end or the other of its range oi": travel.

2, The combination with a typewriter platen and the frame in which it is moun ed, of a lieed-roll-supporting bar mounted in said frame, forwardly and rearwardly-projecting feedwell-supporting arms spaced along and journaled on said bar, front and rear feed-rolls supported by said arms, springs coiled about said bar, one-tor each arm, worm-wheels ournaled on said bar, one

for each spring, each spring: beingconnected at one end to an arm and at its other end to a worm-wheel a spriiig-aclyusting screw 111 mesh with eachworm-wheel, and amount foreachscrew, the. relative positions oi said parts being such that the adjusting screw for a spring connected to a forwardlypro jecting supporting arm may engage its worm-wheel at the rear of said supporting bar, and such that the screw "for a spring connected to rearwardly-projecting sup porting arm may engage its worm-wheel ton wardly or": said supporting bar, whereby all spriz it-ac'ljusting worm-wheels and screws may'be made in duplicate, yet each oi 'said screws may be turned in the same rir it-hand direction to increase the tension of the spring adjusted thereby.

The combination with a letter-spacing carriage, or a typewriter having a platen and a platen-frame mounted therein, a teedroll-supporting bar mounted in said frame, forwardly and rearwari'llyprojecting teedroll-supperting arms spaced along and jour naled on said bar, front and rear feedorolls supportedby said arms, springs coiled about said bar, one for each arm, each spring being connected at one end to the correspond ing arm, and aspring-adjusting device as 'sociated with each spring c'ompr1s1ng'a rotatable member connected with the spring at its other end anda screw, actuatlon oit which will cause rotation of the rotatable member to adjust the tension of the spring, said screws being; disposed with their heads extending downwardly so as to be accessible from below on movement or said carnage to one end orthe other 01. its range 0t travel.

vVlLLIAli l HELlt lOND.

llVitnesses:

' JOHN J. Bnsnnnvrmin, SHIRLEY E. (innnmrm.

ioo 

